How to maintain the valve

Valve is the accessory of equipment and pipeline, its maintenance should be combined with the maintenance of equipment and pipeline.

 

According to the regulations for maintenance and repair of refinery equipment stipulated by the Ministry of chemical industry of raw materials and fuels, the repair contents of high, medium and low pressure valves for oil products, steam, water and various gases with nominal pressure lower than pnl6mpa and medium temperature lower than 550 ℃ can be divided into three categories: minor repair, medium repair and major repair.

 

The repair items included are as follows:

 

Minor repair: clean the oil nozzle and oil cup, replace the packing, clean the valve stem and its thread, remove the impurities in the valve, fasten and replace the bolts, complete the handwheel, etc.

 

Medium repair: including minor repair items, disassembly and cleaning parts, valve body repair, grinding seals, straightening valve stem, etc.

 

Overhaul: including medium repair items, replacement of valve stem, repair of bracket, replacement of spring and seal, etc.

 

In the indoor repair of the valve, in general, minor repair more common, but also should be disassembled to check and replace the gasket.